Make isFragmentReady function work with enabled noUncheckedIndexedAccess tsc setting

[beerose]

Related #9383

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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How Has This Been Tested?

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Checklist:

• I have followed the CONTRIBUTING doc and the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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🦋 Changeset detected

Latest commit: 6e101c2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphql-codegen/client-preset	Patch

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💻 Website Preview

The latest changes are available as preview in: https://4e15b91e.graphql-code-generator.pages.dev

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🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@graphql-codegen/cli	3.3.2-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/visitor-plugin-common	3.2.0-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/typescript-document-nodes	3.0.5-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/gql-tag-operations	3.0.2-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/typescript-operations	3.1.0-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/typescript-resolvers	3.3.0-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/typed-document-node	4.1.0-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/typescript	3.1.0-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/client-preset	3.1.0-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/graphql-modules-preset	3.1.4-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎
@graphql-codegen/plugin-helpers	4.2.1-alpha-20230512151302-6e101c228	npm ↗︎ unpkg ↗︎